I've been ordering a few magazines to get signed at TwinsFest lately. One seller also had an Eddie Guardado signed baseball for less than the price of a ball, so I bought it. It's also JSA authenticated.
The list of players appearing at TwinsFest is up on the Twins web site. It's pretty much the list you'd expect. I always hope to see a few more ex-Twins. Players like Doug Mientkiewicz or Dave Winfield. The players listed so far are great, but most have been there in the past.
I see the Twins signed Jason Kubel to a minor league deal. I hope to see him at TwinsFest, but he's not on the list so far. I'm not sure he's a great choice as a DH. I'd think Target Field is better suited for a right-handed hitter.